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R. C. GREER'. ORE ROASTING AND GALGINING PURNA'GB.

No, 508,542. l Patented Nov. 14, 1893.

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(No Model.) 2 sheets-sheet 2. R. G. GREER. ORE ROASTING AND GALGINING FURNAGB.

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UNITED. STATESv PATENT Ormeay RoBsoN c. roanne, or LEBANON,PnNNsYLvAN1A.L

` oRERoAsTiNeAND oAilclNi'Ne FURNACE.

SPECIFICATION forming part of Letters Patent No. 508,542, dated November 14, 1893. Application liled July 26, 1892. Serial No. 441.2772. (No modeLi To all whom lf/ may concern:

Be it known that I, ROBSON O. GREER, a citizen of the United States, residing at-Lebanon,

in the county of Lebanon, Stateof Pennsylvanla, have invented certain Improvements 1n Ore Roasting and Cal'cining Furnaces, of

which the following is a specification.

l formed in the outer wall.

The main purpose of my invention is to provide a slmple form of roasting furnace l which will produce a thorough and uniform treatment of the ore; and this I effect by means of the'improved'construction hereinafter fully described in connection ,with the accompanying drawings, the Anovel features of which are specicallyzpointed out in the claims.

Figure 1 is a sectional elevation of acircular furnace or kiln embodying my invention.'

Fig. 2 is a half-cross-section on line X X of Fig. 1 and Fig. 3 is a similar section on line Y Y of Fig. 1. Fgsl and 5 illustrate a rrodified construction.

The furnace shown in Figs. 1 to 3 is represented as of the usual circular form. The central cylindrical chamber A which forms in connection with the upward extension h, the smoke stack of the furnace, is surrounded by a wallahaving numerous apertures a arranged at an angle so as to open upwardly into the central chamber; and a passage g in the base of the furnace provides access for cleaning. The annular roasting chamber B formed between the stack walliaand the intermediate wall b, is provided as usual'with a feed opening f at the top and with ore drawing openings or chutesf at" the bottom. This wall b is provided with numerous apertures b corresponding with those in the wall a but inclined in the .opposite direction so as to open downward into the roasting chamber. Between the wall b and the outer wall c of the furnace is formed another annular chamber which extends from practically the highest point of the ore chamber B to near the bottomY of the latter. This third chamber C is adapted to serve as a single large combustion chamber wherein the fuel gases are ignited and consumed, and from which the products of combustion are brought, by means of the numerous openings b', into intimate contact with every portion of the mass of ore stored in the chamber B, through which they must 'pass in order to reach thestack A.

The gas chamber D, by means of which the Vheating is eifected, circles the entire roaster and forms the base of the combustion chamber C into which a series of ports dopen from it while gas is fed to the chamber D from any convenient source through the connection d. Air ports e ande', the latter passing to the -rear of the gas chamber, open into the combustion chamber adjacent to and on opposite sides of each gas inlet d, thus insuring an intimate blending of air with the lighted gas; peep holes c are also provided at ,numerous points in the outer wall from which the lplugs which close them may be readily removed if an additional supply of air' to the chamber C is required to insure perfect combustion. Thus far the construction isv identical with that shown, described, and claimed in my pending application, serially numbered 424,-620. Air may be supplied to the ports ele either directly through openings e2 in the outer wall, as in the construction disclosedin the above-mentioned case or through vertical passage ways E arranged in close proximity to the combustion chamber C, extending the whole height of said chamber and communicating with an annular air chamber E located directly over the combustion chamber; air being admitted to said air chamber and highly heated therein and in the vertical passage ways E before issuingfrom the mouths of the ports e e into the combustion chamber.

In the modified form of furnaceshown in Figs. 4 and 5 the latterl being a cross-section through Y Y of Fig. 4, thel arrangement of all the chambers is substantially the Asame as in Figs. 1 to 3 but the usual circular form with the stack in the center is departed from, the structure being rectangular with the` stack at the rear, and the ore-roasting chamber lying between it and the combustion chamber and communicating with both as in the previously IOO described construction. This form of furnace 1s more cheaplyconstructed than the circular and equally embodies all the features of my invention.

By means of my improved construction not only is a very simple form of furnace produced requiring `but a single gas chamber and a large combustion chamberextending the full height of the roasting chamber but better and more economical results are produced in operating it; the large combustion chamber and the facility with Which a sucient amount of air is admitted to it., insure superior combustion, and the uniformity with which the entire contents of the roaster are treated dueto the directcommunication at all points of its height `with the combustion chamber, greatly increases its capacity and the thoroughness of the work.

What I claim is- 1. In an ore roasting or calcining furnace, the combination With the stack, the combustion chamber, and the ore roasting chamber located between the combustion chamber and stack, and having communication on one side with said combustion chamber and on its opposite side with said stack, of the gas chamber D located at the base of said combustion chamber and `having exits d, and air passages .andere roasting chambers being of substantially the same height, of the gas chamberD locatedat the base of said combustion cham` ber and having exits d, and air passages E `having inlet ports near the top of the combustion chamber and outlet ports adjacent to said exits d, substantially as set forth.

3. An ore roasting or calcining furnace, having a rectangular stack, a rectangular combustion chamber, and a rectangular ore roasting chamber, said roasting chamber being located between said combustion chamber and stack and communicating on one side .at different points in its height with said stack and on its opposite side at different points in its height with the combustion chamber, said combustion and ore roasting chambers being of substantially the same height, substantially as set forth.

4. Inanore roasting or calcining furnace, the combination with the rectangular stack, and .rectangular ore roasting chamber, of a Arectamgular combustion chamber having communication with said roastingchamber, said combustion chamber having in its base agas cl1amber.D'with gas exits in thefrtopot' same and also having air ports adjacent to'said gas exits, substantially as set forth.

5. In an ore roasting or calcining furnace, the combination of the rectangular stack, the rectangular orelroasting chamber communieating therewith, and the rectangular combustion chamber communicating with said ore roasting chamber, said ore roasting chamber being located between said combustion chamber and stack, and said combustion chamber having in its base a gas chamber' D with gas exits in the top of same and also air inlet opening into it adjacent. to said gas exits and air inlets .opening into it at various points, snbstautiallyas set forlth.

(l. In .an oreiroastingor calcining furnace, the combination With .the 4rectangular stack, of the rectangular orc roasting chambenthe rectangular combustion chamber, said roasting chamber being located betweenthe combustion chamber and stack and .having-.communication with both ofthe same, andsaid combustion chamberhaving in its Abaseagas chamber D with gas exits in .the top of .the sameandair passages E with inlet' portsnear the top of the combustion chamber andeutlet ports adjacent to said gas exits, substantially as set forth.

7. The combination, inanore roastingand calcining furnace, with the stack, .and `the ore roasting chamber communicating with said stack, of the combustion `chamber having communication with the ore roasting chamber, and a gas chamber, 4located `in ,the base of said com bustionchamberand. having gas exits in its top, the Wall of said combustion chamber being formed to provide ,air passages, E with inlet ports near the .top of the combustion chamber andoutlet ponts adjacent to said gas exits, substantial1y.asdescribed.

8. In an ore roasting and calcining furnace, the combinationof the rectangularstackfand the rectangular combustion chamber,.locatcd at opposite sides of the furnace,.with=the rectangular roasting chamber betweeusaid stack IOO IIO

and combustion chamber, said combustion ROBSON C.

Witnesses:

GEO. H. MORGAN, H. A. ROBY.

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